How to draw circle in android by pressing a button?

Question

I want to show small dots on screen while pressing a button, something like pin code...

switch (view.getId()){
    case R.id.buttonNum1:
               


        

Answer 1

You can achive by creating ripple effect

create one drawable name like pin_button_ripple in drawable-v21 folder and add bellow code

<ripple xmlns:android="http://schemas.android.com/apk/res/android"
        android:color="?android:colorControlHighlight">
    <item android:id="@android:id/mask">
        <shape android:shape="oval">
            <solid android:color="?android:colorPrimary" />

        </shape>
    </item>
</ripple>

Now in Layout file set it as a background of button and define click listener in activity

<Button
    android:id="@+id/btnPinButton"
    android:layout_width="100dp"
    android:layout_height="100dp"
    android:layout_centerInParent="true"
    android:background="@drawable/pin_button_ripple"
    android:padding="20dp"
    android:text="10"/>

You will see the ripple effect in circle shape like we enter Pin number or password via keyboard and showing that effect